linux-kernel - Re: [PATCH 01/16] Add the ability to lock down access to the running kernel image

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Message-ID: <20161225212023.GB26891@amd>
Date:   Sun, 25 Dec 2016 22:20:24 +0100
From:   Pavel Machek <pavel@....cz>
To:     David Howells <dhowells@...hat.com>
Cc:     keyrings@...r.kernel.org, matthew.garrett@...ula.com,
        linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/16] Add the ability to lock down access to the running
 kernel image

Hi!

> allow the running kernel image to be changed including the loading of
> modules that aren't validly signed with a key we recognise, fiddling with
> MSR registers and disallowing hibernation,

"." at EOL.

> @@ -158,6 +158,21 @@ config HARDENED_USERCOPY_PAGESPAN
>  	  been removed. This config is intended to be used only while
>  	  trying to find such users.
>  
> +config LOCK_DOWN_KERNEL
> +	bool "Allow the kernel to be 'locked down'"

Locked down, or 'locked down' ? :-).

> +	help
> +	  Allow the kernel to be locked down under certain circumstances, for
> +	  instance if UEFI secure boot is enabled.  Locking down the kernel
> +	  turns off various features that might otherwise allow access to the
> +	  kernel image (eg. setting MSR registers).

I'd add something that clarifies it is "running" kernel image.

> +config ALLOW_LOCKDOWN_LIFT
> +	bool

Don't you need to add 'bool "something"' so that user can actually
select this?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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